[Android] ViewPager2 With Tab + Bar

binding.viewPager.apply {
	this.adapter = pageAdapter
    val itemCount = pageAdapter.itemCount // page 갯수
    val barWidth = screenWidth() / itemCount // page 갯수에 따라 bar 의 width 값 설정
    val params = RelativeLayout.LayoutParams(barWidth, 30)
    binding.bar.apply {
    	binding.bar.layoutParams = params
    }

	this.registerOnPageChangeCallback(object : ViewPager2.OnPageChangeCallback() {
    	override fun onPageScrolled(
                    position: Int,
                    positionOffset: Float,
                    positionOffsetPixels: Int
                ) {
                    super.onPageScrolled(position, positionOffset, positionOffsetPixels)
                    val translatePosition = barWidth * position // bar 의 시작 포지션 위치
                    val translateOffset = barWidth * positionOffset // page 의 offset 만큼 이동
                    binding.bar.translationX = translatePosition + translateOffset
                }
            })
		 }